Parallel Refinements for Lexically Constrained Text Generation with BART Xingwei He author 2021-11 text Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Online and Punta Cana, Dominican Republic conference publication he-2021-parallel 10.18653/v1/2021.emnlp-main.681 https://aclanthology.org/2021.emnlp-main.681/ 2021-11 8653 8666